I used to live near Ronda with guest letting accommodation and this was a frequently asked question. It's as Costakid and Manchesteral say: bus to Marbella bus station and then bus to Ronda, but the last time I looked for a visitor it was even better inasmuchas the first bus leg of the journey stops at the airport!The rail options are tortuous or inconvenient as also mentioned by country boy.

thanks to Trooperman and Roz ... my sister was needing bus/train info to visit daughter recently moved to Ronda ... neither of them drive ... so train and especially bus info much appreciated ... I have passed on to said sis ... thanks again